A company’s tax rate is often modeled as if it were broadly stable over time. Lowe’s shows that public policy can alter that baseline in a way that materially changes reported economics.

The chart below tracks Lowe’s GAAP and cash tax rates, adjusted for unusual items and pension-related distortions. For many years, both series sat at materially higher levels, generally in the high-30s to low-40s. Then the range broke lower.

Lowe's GAAP and Cash Taxes

That is not a minor fluctuation. It is a regime change. And the most obvious explanation is the Tax Cuts and Jobs Act, the late-2017 reform that cut the federal corporate tax rate to 21% for tax years beginning in 2018.

The distinction between GAAP taxes and cash taxes matters here. Cash taxes can run below GAAP taxes for meaningful stretches because companies work hard to defer payment, but the longer-run picture is more revealing: the 5-year moving averages in the chart show cash taxes tending to move back toward GAAP taxes over time. In other words, companies can often change the timing of taxes, but they have a harder time escaping the underlying economics indefinitely.

That is why the chart is so useful. It does not just show that Lowe’s cash taxes fell. It shows that both the accounting burden and the cash burden eventually reset lower, which makes the policy effect much harder to dismiss as temporary noise.

This also ties naturally to my recent post on the CHIPS Act, data centers, and semiconductors (here). The channel is different, but the lesson is the same: government decisions can leave visible fingerprints on corporate results. Here, that fingerprint runs through the tax line.

The real takeaway: good analysis is not just about reading reported numbers; it is about recognizing when those numbers are being shaped by a change in the rules of the game.